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Kurogane Shishio just returned to the country after a successful business deal overseas. It was only days after he came back but he already started spreading their influence in the company once more. His wife on the other hand, was displeased with the response she got when she tried to dissuade her husband from taking in his and Kyouko's son. There was already very little dispute about whether or not Kouzuki Kazuya was indeed related to him because the resemblance between them was very obvious.
Not only did he refuse to listen to Nagisa, Shishio also pushed back his plans to have a child with her. If she gave birth to a son then she would have been less threatened even if they were able to take Kazuya from Kyouko. He was but a child so what can he do to her?